ST. CLOUD — A city employee who is not a member of the city's 2-year-old union is calling for an election to unseat the organization.

Union representatives say it is too early to say whether the move to decertify the International Brotherhood of Electrical Workers Local Union 66 is serious.

According to the Public Employees Relations Committee, which regulates the election of unions, 35 people -- or slightly more than 33 percent of the 105 St. Cloud members -- have turned in cards requesting the election.

The committee is expected to meet later this week to check the validity of the cards. If 33 percent of the union members sign cards asking for an election, PERC will hold one within 30 days as required by state law.

Yvonne Tidd, a customer services representative who is not a member of the union, filed the request. She said she opposes the organization of city workers because unionized employees aren't getting a good deal.

Non-union members receive a family insurance plan paid by the city, she said, while union members only are insured individually.

Also, she said, non-union employees received a 4 percent raise last year; union members received a 3 percent raise.

Dan Swaford, assistant business manager of the union, said the union's contract with the city, ratified in October 1984, included a 3 percent across- the-board raise as well as a 3 percent merit increase. No members have been denied the merit increase, he said.

About 60 percent of the city's employees also received equity raises when their job classifications were changed, he said.

''This whole thing is very preliminary,'' Swaford said. ''We haven't even established the validity of the certificates. We'd like to keep it out of the limelight until we verify that it is legitimate.''